鍍鋅方管的國標(biāo)與非國標(biāo)的區(qū)別——：就是管壁的實(shí)際厚度非標(biāo)的都比國標(biāo)的壁薄一些的。主要規(guī)格不是很標(biāo)準(zhǔn)，舉個例子：鍍鋅方管的國標(biāo)與非國標(biāo)的區(qū)別（1）非標(biāo)的都比國標(biāo)的壁薄一些的（2）非標(biāo)的定尺長度也沒有達(dá)到國標(biāo)；（3）非標(biāo)的比國標(biāo)便宜

The difference between the national standard and the national standard of galvanized square pipe is that the actual thickness of the pipe wall is thinner than that of the national standard. The main specifications are not very standard. For example, the difference between the national standard and the national standard for galvanized square tubes (1) the non-standard is thinner than the national standard (2) the non-standard length is not up to the national standard; (3) the non-standard is cheaper than the national standard.